/* ============================================================
   site.css — global-data-network
   设计系统：全球黑蓝数据网络（深黑底 / 深蓝承托 / 青色链路）
   组件：节点卡、带连接线流程卡、宽幅频道带、网络节点式 FAQ
   与批内其它站点结构差异：无渐变玻璃、直角面板 + 虚线链路
   ============================================================ */

:root {
    --bg: #05080f;
    --bg-deep: #04070d;
    --panel: #0a1424;
    --panel-raise: #0d1a30;
    --blue: #0b2447;
    --blue-deep: #0a1d3a;
    --cyan: #06b6d4;
    --cyan-soft: #7de8f7;
    --line: #1e3a63;
    --line-cyan: rgba(6, 182, 212, 0.35);
    --text: #dce9f7;
    --text-soft: #9db4d6;
    --text-dim: #64799c;
    --radius: 4px;
    --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    background-image:
        radial-gradient(rgba(6, 182, 212, 0.08) 1px, transparent 1.6px),
        linear-gradient(180deg, rgba(11, 36, 71, 0.6), transparent 420px);
    background-size: 26px 26px, 100% 640px;
    color: var(--text);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    display: block;
    max-width: 100%;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 20px;
    padding-right: 20px;
}

.mono {
    font-family: var(--mono);
}

.center {
    text-align: center;
}

/* ---------- 顶部：高密度导航 + 全球入口辅助栏 ---------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 60;
    background-color: rgba(5, 8, 15, 0.96);
    border-bottom: 1px solid var(--line);
}

.nav-row {
    display: flex;
    align-items: center;
    gap: 18px;
    min-height: 62px;
}

.brand {
    font-weight: 800;
    font-size: 17px;
    letter-spacing: 0.01em;
    color: var(--text);
    white-space: nowrap;
}

.brand::before {
    content: "";
    display: inline-block;
    width: 9px;
    height: 9px;
    margin-right: 9px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.8);
    vertical-align: 1px;
}

.nav-list {
    display: flex;
    gap: 4px;
    margin-left: 12px;
}

.nav-list a {
    padding: 8px 12px;
    color: var(--text-soft);
    font-size: 15px;
    border-left: 1px solid transparent;
    transition: color 0.15s ease;
}

.nav-list a:hover {
    color: var(--cyan-soft);
    border-left-color: var(--line-cyan);
}

.cta-chip {
    margin-left: auto;
    padding: 9px 16px;
    border: 1px solid var(--line-cyan);
    color: var(--cyan-soft);
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.cta-chip:hover {
    background: var(--cyan);
    color: #04131c;
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    margin-left: auto;
    border: 1px solid var(--line);
    background: var(--panel);
    color: var(--cyan-soft);
    font-size: 18px;
    cursor: pointer;
}

.util-bar {
    border-top: 1px solid var(--line);
    background-color: #070d18;
}

.util-inner {
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 34px;
    font-size: 13px;
    color: var(--text-dim);
}

.util-item i {
    margin-right: 6px;
    color: var(--cyan);
}

.util-sep {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--line-cyan);
}

/* ---------- 首页 Hero：左大标题 + 右侧主图与浮层节点卡 ---------- */

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    align-items: center;
    padding: 66px 20px 76px;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-kicker {
    color: var(--cyan);
    font-size: 12px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

.hero-title {
    margin: 16px 0 18px;
    font-size: clamp(30px, 4.2vw, 46px);
    line-height: 1.3;
    font-weight: 800;
    letter-spacing: 0.01em;
}

.hero-lead {
    font-size: 17px;
    color: var(--text);
}

.hero-sub {
    margin-top: 10px;
    color: var(--text-soft);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 24px 0 28px;
}

.hero-tags span {
    padding: 6px 12px;
    border: 1px dashed var(--line-cyan);
    border-radius: var(--radius);
    color: var(--cyan-soft);
    font-size: 13px;
    font-family: var(--mono);
}

.hero-actions,
.final-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}

.btn-cyan,
.btn-ghost,
.btn-outline {
    display: inline-block;
    padding: 13px 26px;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 15px;
    min-height: 46px;
    line-height: 1.3;
}

.btn-cyan {
    background: var(--cyan);
    border: 1px solid var(--cyan);
    color: #04131c;
}

.btn-cyan:hover {
    background: var(--cyan-soft);
}

.btn-ghost {
    border: 1px solid var(--line-cyan);
    color: var(--cyan-soft);
}

.btn-ghost:hover {
    background: rgba(6, 182, 212, 0.12);
}

.btn-outline {
    border: 1px solid var(--line);
    color: var(--text-soft);
}

.btn-outline:hover {
    border-color: var(--line-cyan);
    color: var(--cyan-soft);
}

.hero-visual {
    position: relative;
}

.hero-visual img {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    border: 1px solid var(--line-cyan);
    border-radius: var(--radius);
    max-height: 640px;
}

.hero-visual::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    background-image:
        linear-gradient(rgba(6, 182, 212, 0.14) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6, 182, 212, 0.14) 1px, transparent 1px);
    background-size: 44px 44px;
    pointer-events: none;
}

.node-panel {
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 14px;
    padding: 14px 16px 12px;
    background: rgba(5, 8, 15, 0.9);
    border: 1px solid var(--line-cyan);
    border-radius: var(--radius);
}

.node-panel-title {
    color: var(--cyan);
    font-size: 11px;
    letter-spacing: 0.14em;
}

.node-status-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 5px 0;
    border-top: 1px dashed rgba(6, 182, 212, 0.22);
    font-size: 14px;
}

.node-status-row dt {
    color: var(--text-soft);
}

.node-status-row dd {
    color: var(--cyan-soft);
    font-family: var(--mono);
}

/* ---------- 通用分区头 ---------- */

.section {
    border-top: 1px dashed rgba(6, 182, 212, 0.2);
}

.section,
.inner-section {
    padding: 56px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.sec-head {
    margin-bottom: 30px;
}

.sec-label {
    color: var(--cyan);
    font-size: 12px;
    letter-spacing: 0.2em;
}

.sec-title {
    margin-top: 8px;
    font-size: 26px;
    font-weight: 800;
    line-height: 1.4;
}

.sec-desc {
    margin-top: 10px;
    color: var(--text-soft);
    max-width: 720px;
}

/* ---------- 入口节点：4 节点卡 ---------- */

.gate-grid {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.gate-card,
.route-card {
    position: relative;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px 18px;
}

.gate-card:hover,
.route-card:hover {
    border-color: var(--line-cyan);
}

.gate-dot {
    display: inline-block;
    width: 9px;
    height: 9px;
    margin-bottom: 12px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 8px rgba(6, 182, 212, 0.7);
}

.gate-card h4,
.route-card h4 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
}

.gate-card p,
.route-card p {
    color: var(--text-soft);
    font-size: 14.5px;
}

/* ---------- 体育频道：2 宽幅卡 ---------- */

.wide-stack {
    list-style: none;
    display: grid;
    gap: 20px;
}

.wide-card {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
}

.wide-fig {
    min-height: 100%;
}

.wide-fig img {
    width: 100%;
    height: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.wide-body {
    padding: 24px 26px;
}

.wide-body h4,
.game-body h4 {
    font-size: 19px;
    margin-bottom: 12px;
}

.note-list {
    list-style: none;
    margin: 0 0 16px;
}

.note-list li {
    position: relative;
    padding: 6px 0 6px 18px;
    color: var(--text-soft);
    font-size: 15px;
}

.note-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 16px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--line-cyan);
}

.text-link {
    color: var(--cyan-soft);
    font-family: var(--mono);
    font-size: 13px;
}

.text-link:hover {
    color: var(--cyan);
}

/* ---------- 娱乐频道宽幅卡 ---------- */

.game-band {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
}

.game-fig img {
    width: 100%;
    height: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.game-body {
    padding: 24px 26px;
}

/* ---------- 多端流程：带连接线 4 卡 ---------- */

.flow-4 {
    list-style: none;
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.flow-4::before {
    content: "";
    position: absolute;
    top: 9px;
    left: 18px;
    right: 18px;
    border-top: 1px dashed var(--line-cyan);
    pointer-events: none;
}

.flow-card {
    position: relative;
    padding-top: 34px;
}

.flow-card::before {
    content: "";
    position: absolute;
    top: 5px;
    left: calc(50% - 5px);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.75);
}

.flow-card h4 {
    font-size: 16.5px;
    margin-bottom: 8px;
    color: var(--cyan-soft);
}

.flow-card p {
    color: var(--text-soft);
    font-size: 14.5px;
}

/* ---------- 活动条目 ---------- */

.event-list {
    list-style: none;
    display: grid;
    gap: 14px;
}

.event-row {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
    padding: 16px 18px;
    background: var(--panel);
    border-left: 3px solid var(--line-cyan);
    border-radius: var(--radius);
}

.event-chip {
    color: var(--cyan);
    font-size: 12px;
    letter-spacing: 0.12em;
    padding-top: 6px;
}

.event-main h4 {
    font-size: 17px;
    margin-bottom: 4px;
}

.event-main p {
    color: var(--text-soft);
    font-size: 14.5px;
}

/* ---------- 口碑 3 卡 ---------- */

.voice-grid {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.voice-card {
    position: relative;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px 20px;
}

.voice-card::before {
    content: "“";
    position: absolute;
    top: 2px;
    left: 14px;
    color: var(--cyan);
    font-size: 42px;
    font-family: Georgia, serif;
    opacity: 0.55;
}

.voice-quote {
    padding-top: 16px;
    font-size: 15px;
    color: var(--text);
}

.voice-from {
    margin-top: 10px;
    color: var(--text-dim);
    font-size: 13px;
    font-family: var(--mono);
}

/* ---------- 网络节点式 FAQ ---------- */

.faq-list {
    max-width: 860px;
}

.faq-item {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    margin-bottom: 10px;
}

.faq-item summary {
    position: relative;
    list-style: none;
    cursor: pointer;
    padding: 16px 20px 16px 46px;
    font-weight: 600;
    font-size: 15.5px;
    color: var(--text);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::before {
    content: "";
    position: absolute;
    left: 18px;
    top: 22px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 8px rgba(6, 182, 212, 0.65);
}

.faq-item summary::after {
    content: "+";
    position: absolute;
    right: 18px;
    top: 12px;
    color: var(--cyan-soft);
    font-family: var(--mono);
    font-size: 18px;
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-answer {
    padding: 0 20px 16px 46px;
    color: var(--text-soft);
    font-size: 15px;
}

/* ---------- Final CTA 青色带 ---------- */

.final-band {
    text-align: center;
    background-image:
        linear-gradient(90deg, rgba(11, 36, 71, 0.65), rgba(6, 182, 212, 0.14), rgba(11, 36, 71, 0.65)),
        repeating-linear-gradient(90deg, transparent 0 34px, rgba(6, 182, 212, 0.2) 34px 35px);
    border: 1px solid var(--line-cyan);
    border-radius: var(--radius);
    padding: 44px 24px;
}

.final-title {
    font-size: 26px;
    font-weight: 800;
    margin: 10px 0;
}

.final-desc {
    color: var(--text-soft);
    margin-bottom: 22px;
}

.final-actions {
    justify-content: center;
}

/* ---------- 内页共用：页首说明区 ---------- */

.page-lead {
    padding: 52px 20px 26px;
    max-width: 1200px;
    margin: 0 auto;
}

.page-title {
    margin-top: 14px;
    font-size: clamp(27px, 3.4vw, 36px);
    line-height: 1.35;
    font-weight: 800;
}

.page-lead-text {
    margin-top: 12px;
    max-width: 780px;
    color: var(--text-soft);
    font-size: 16px;
}

.page-cta {
    max-width: 1200px;
    margin: 0 auto;
    padding: 34px 20px 64px;
}

/* ---------- About：网格叙事 ---------- */

.mesh-split {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
    align-items: start;
}

.mesh-copy p {
    color: var(--text-soft);
    margin-bottom: 14px;
}

.mesh-figure img {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    border: 1px solid var(--line-cyan);
    border-radius: var(--radius);
    max-height: 560px;
}

.mesh-figure figcaption,
.aside-fig figcaption {
    margin-top: 8px;
    color: var(--text-dim);
    font-size: 13px;
}

.route-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.principle-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 6px;
}

.principle-item {
    background: var(--panel);
    border-top: 2px solid var(--line-cyan);
    padding: 16px 18px;
    border-radius: var(--radius);
}

.principle-item dt {
    font-weight: 800;
    font-size: 16px;
    color: var(--cyan-soft);
}

.principle-item dd {
    margin-top: 6px;
    color: var(--text-soft);
    font-size: 14px;
}

.boundary-card {
    background: var(--panel-raise);
    border: 1px dashed var(--line-cyan);
    border-radius: var(--radius);
    padding: 26px 28px;
}

/* ---------- Product：宽幅带与带间连接线 ---------- */

.matrix-band {
    border-top: 1px dashed rgba(6, 182, 212, 0.24);
    padding-top: 26px;
}

.band-head {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 18px;
}

.band-kicker {
    color: var(--cyan);
    font-size: 12px;
    letter-spacing: 0.18em;
}

.band-title {
    font-size: 23px;
    font-weight: 800;
}

.band-fig-wide {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.band-fig-wide img {
    width: 100%;
    aspect-ratio: 21 / 9;
    object-fit: cover;
}

.point-row {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-top: 16px;
}

.point-row.vertical {
    grid-template-columns: 1fr;
    margin-top: 0;
}

.point-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px 18px;
}

.point-card .gate-dot {
    margin-bottom: 8px;
    width: 7px;
    height: 7px;
    box-shadow: none;
}

.point-card h4 {
    font-size: 16px;
    margin-bottom: 6px;
}

.point-card p {
    color: var(--text-soft);
    font-size: 14px;
}

.split-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 26px;
    align-items: center;
}

.split-band.reversed .split-inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
}

.split-fig img {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    max-height: 520px;
}

/* ---------- News：feed 行 + 侧栏图位 ---------- */

.news-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 36px;
    align-items: start;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

.feed-list {
    list-style: none;
    border-top: 1px dashed var(--line-cyan);
}

.feed-row {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 22px;
    padding: 22px 6px;
    border-bottom: 1px dashed rgba(6, 182, 212, 0.22);
}

.feed-date {
    color: var(--cyan);
    font-size: 13px;
    padding-top: 4px;
}

.feed-cat {
    display: inline-block;
    padding: 2px 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    color: var(--cyan-soft);
    font-size: 12px;
    font-family: var(--mono);
}

.feed-title {
    margin: 8px 0 6px;
    font-size: 18.5px;
    font-weight: 700;
}

.feed-excerpt {
    color: var(--text-soft);
    font-size: 15px;
    margin-bottom: 8px;
}

.news-aside {
    display: grid;
    gap: 26px;
}

.aside-block {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
}

.aside-fig img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    border-radius: var(--radius);
}

.aside-fig + .aside-fig {
    margin-top: 14px;
}

.tag-cluster {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 10px 0;
}

.tag-cluster span {
    display: inline-block;
    padding: 5px 10px;
    border: 1px dashed var(--line-cyan);
    border-radius: var(--radius);
    color: var(--cyan-soft);
    font-size: 13px;
}

.aside-note {
    color: var(--text-dim);
    font-size: 13px;
    border-top: 1px solid var(--line);
    padding-top: 10px;
}

/* ---------- Contact：中心节点 + 外围节点 ---------- */

.hub-band {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 0;
    max-width: 1200px;
    margin: 8px auto 0;
    background: var(--panel);
    border: 1px solid var(--line-cyan);
    border-radius: var(--radius);
    overflow: hidden;
}

.hub-fig img {
    width: 100%;
    height: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.hub-desk {
    padding: 30px 32px;
}

.hub-desc {
    color: var(--text-soft);
    margin: 12px 0 18px;
}

.hub-spec-row {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 14px;
    padding: 10px 0;
    border-top: 1px dashed rgba(6, 182, 212, 0.24);
    font-size: 15px;
}

.hub-spec-row dt {
    color: var(--cyan-soft);
}

.hub-spec-row dd {
    color: var(--text-soft);
}

.outer-grid {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.outer-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px 18px;
}

.outer-card h4 {
    font-size: 17px;
    margin-bottom: 8px;
}

.outer-card .note-list {
    margin-bottom: 0;
}

.outer-card .note-list li {
    font-size: 14px;
}

/* ---------- App：端点卡与步骤 ---------- */

.endpoint-lead {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
    align-items: center;
}

.endpoint-mini {
    list-style: none;
    margin-top: 16px;
}

.endpoint-mini li {
    position: relative;
    padding: 6px 0 6px 20px;
    color: var(--cyan-soft);
    font-size: 14.5px;
}

.endpoint-mini li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 15px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--cyan);
}

.endpoint-fig img {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    border: 1px solid var(--line-cyan);
    border-radius: var(--radius);
    max-height: 560px;
}

.endpoint-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.endpoint-card {
    background: var(--panel);
    border-top: 2px solid var(--line-cyan);
    border-radius: var(--radius);
    padding: 20px 22px;
}

.endpoint-kicker {
    color: var(--cyan);
    font-size: 12px;
    letter-spacing: 0.2em;
    margin-bottom: 8px;
}

.endpoint-card h4 {
    font-size: 18px;
    margin-bottom: 6px;
}

.endpoint-card p {
    color: var(--text-soft);
    font-size: 14.5px;
}

.steps {
    counter-reset: step;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.steps li {
    counter-increment: step;
    position: relative;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 46px 20px 18px;
}

.steps li::before {
    content: counter(step);
    position: absolute;
    top: 12px;
    left: 18px;
    font-family: var(--mono);
    font-size: 20px;
    font-weight: 700;
    color: var(--cyan);
}

.steps h4 {
    font-size: 16.5px;
    margin-bottom: 6px;
}

.steps p {
    color: var(--text-soft);
    font-size: 14px;
}

.compat-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.compat-list li {
    position: relative;
    background: var(--panel);
    border-left: 3px solid var(--line-cyan);
    border-radius: var(--radius);
    padding: 16px 18px;
    color: var(--text-soft);
    font-size: 14.5px;
}

/* ---------- Footer：黑底 + 青色节点线 + 四列 ---------- */

.site-footer {
    background: var(--bg-deep);
    border-top: 1px solid var(--line);
}

.site-footer::before {
    content: "";
    display: block;
    height: 8px;
    background-image: radial-gradient(circle at 7px 4px, rgba(6, 182, 212, 0.8) 2px, transparent 2.6px);
    background-size: 24px 8px;
    background-repeat: repeat-x;
    opacity: 0.7;
}

.foot-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 28px;
    padding-top: 40px;
    padding-bottom: 24px;
}

.brand-foot {
    display: inline-block;
    font-weight: 800;
    font-size: 16px;
}

.brand-foot::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 8px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 8px rgba(6, 182, 212, 0.7);
    vertical-align: 1px;
}

.foot-note {
    margin-top: 10px;
    color: var(--text-dim);
    font-size: 13.5px;
}

.foot-title {
    color: var(--cyan);
    font-size: 13px;
    letter-spacing: 0.16em;
    font-family: var(--mono);
    margin-bottom: 10px;
}

.foot-menu {
    list-style: none;
}

.foot-menu li {
    margin-bottom: 6px;
}

.foot-menu a {
    color: var(--text-soft);
    font-size: 14px;
}

.foot-menu a:hover {
    color: var(--cyan-soft);
}

.foot-friend {
    border-top: 1px dashed rgba(6, 182, 212, 0.3);
    padding-top: 16px;
    padding-bottom: 18px;
}

.foot-friend-title {
    color: var(--cyan);
    font-size: 13px;
    letter-spacing: 0.16em;
    font-family: var(--mono);
    margin-bottom: 10px;
}

.friend-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
}

.friend-list a {
    color: var(--text-dim);
    font-size: 13.5px;
    border-bottom: 1px dashed var(--line);
}

.friend-list a:hover {
    color: var(--cyan-soft);
    border-bottom-color: var(--line-cyan);
}

.foot-bottom {
    border-top: 1px solid var(--line);
    padding-top: 16px;
    padding-bottom: 26px;
    color: var(--text-dim);
    font-size: 13px;
    display: grid;
    gap: 6px;
}

.foot-play {
    color: var(--text-soft);
}

/* ---------- 响应式：桌面 < 1024px ---------- */

@media (max-width: 1024px) {
    .gate-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .news-layout {
        grid-template-columns: 1fr;
    }

    .news-aside {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: start;
    }

    .flow-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 22px;
    }

    .flow-4::before {
        display: none;
    }

    .principle-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* ---------- 响应式：平板 < 900px ---------- */

@media (max-width: 900px) {
    .nav-list {
        display: none;
        position: absolute;
        left: 0;
        right: 0;
        top: 62px;
        flex-direction: column;
        background: rgba(7, 13, 24, 0.98);
        border-bottom: 1px solid var(--line);
        padding: 10px 20px 16px;
        margin-left: 0;
    }

    body.nav-open .nav-list {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .cta-chip {
        display: none;
    }

    .hero {
        grid-template-columns: minmax(0, 1fr);
        gap: 34px;
        padding-top: 46px;
    }

    .hero-visual {
        max-width: 520px;
    }

    .wide-card,
    .game-band {
        grid-template-columns: minmax(0, 1fr);
    }

    .wide-fig img,
    .game-fig img {
        aspect-ratio: 16 / 9;
    }

    .voice-grid,
    .route-list,
    .outer-grid,
    .endpoint-grid,
    .compat-list,
    .point-row {
        grid-template-columns: 1fr;
    }

    .split-inner,
    .split-band.reversed .split-inner {
        grid-template-columns: minmax(0, 1fr);
    }

    .mesh-split,
    .endpoint-lead {
        grid-template-columns: minmax(0, 1fr);
    }

    .hub-band {
        grid-template-columns: minmax(0, 1fr);
    }

    .hub-fig img {
        max-height: 380px;
    }

    .steps {
        grid-template-columns: minmax(0, 1fr);
    }

    .foot-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* ---------- 响应式：手机 < 640px ---------- */

@media (max-width: 640px) {
    body {
        font-size: 15px;
    }

    .container,
    .hero,
    .section,
    .inner-section,
    .page-lead,
    .page-cta,
    .news-layout {
        padding-left: 16px;
        padding-right: 16px;
    }

    .brand {
        font-size: 14.5px;
    }

    .gate-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .flow-4 {
        grid-template-columns: minmax(0, 1fr);
    }

    .event-row {
        grid-template-columns: minmax(0, 1fr);
        gap: 6px;
    }

    .event-chip {
        padding-top: 0;
    }

    .feed-row {
        grid-template-columns: minmax(0, 1fr);
        gap: 6px;
    }

    .feed-date {
        padding-top: 0;
    }

    .hub-spec-row {
        grid-template-columns: 104px minmax(0, 1fr);
    }

    .news-aside {
        grid-template-columns: minmax(0, 1fr);
    }

    .point-row.vertical {
        margin-top: 0;
    }

    .band-fig-wide img {
        aspect-ratio: 16 / 9;
    }

    .hero-actions .btn-cyan,
    .hero-actions .btn-ghost {
        width: 100%;
        text-align: center;
    }
}